Hello Ralph,
medium format and autofocus is like a Porsche with a camping trailer. You should try to find out why your pictures are out of focus. Maybe the solution is a simple eye correction lens made by an optometrist or a magnifying viewfinder. If you only don't have time to focus quickly enough you should take a F-5 or F-100.

I've never used one, but the Fuji GA645 family received some good reviews, if you are happy with a fixed focal length (60mm on the GA645, 45mm on the GA645W) or 55-90mm zoom (GA645ZI). See http://www.dantestella.com/technical/ga645.html.

I love my Fuji GA645zi. The autofucus and wind are seriously loud, but other than that, it never disappoints. Even the slow lens doesn't seem to be a big issue because it is so easy to hand hold to silly low speeds.

Autofocus and medium format - will move you into 645 territory. Unless you like the Rollei 6008AF - same beautiful Zeiss glass as Hasselblad, and 6x6 shooting.
Otherwise I'd gladly recommend the Contax 645 cameras as well. Very good autofocus capabilities. The Pentax 645 cameras seem to work really well and have lots of happy users.

Good luck, Ralph!

"Often moments come looking for us". - Robert Frank

"Make good art!" - Neil Gaiman

"...the heart and mind are the true lens of the camera". - Yousuf Karsh